OK, so with the magic of debug symbols and gdb on Cosmic:
(gdb) run
...
ens8: Gained IPv6LL
Assertion 'link->state == LINK_STATE_SETTING_ADDRESSES' failed at
../src/network/networkd-link.c:803, function link_enter_set_routes(). Aborting.
...
(gdb) up
#3 0x000055555566b194 in link_enter_set_routes (link=0x55555571d050) at
../src/network/networkd-link.c:803
803 ../src/network/networkd-link.c: No such file or directory.
(gdb) p link->state
$3 = LINK_STATE_PENDING
Looking at the code, it seems we are hitting link_enter_set_routes()
before link_enter_set_addresses() which is where the state is set. We're
hitting link_enter_set_routes() because link_check_ready() now calls it
straight off the bat.
I think the backport just needs to add a check to not flow through to
setting the routes until after we've gone through the process of setting
the addresses; we can do that with the attached patch. (It applies to
the cosmic version, I haven't tested it against Bionic.)
Having said that Dan you've obviously had a closer look at the code and more
recently, what patches did you think were needed? It looks like perhaps you
could solve this by backporting c42ff3a1a7bf ("networkd: Track address
configuration")
and 289e6774d0da ("networkd: Use only a generic CONFIGURING state") - is that
what you had in mind?
** Patch added:
"0001-Do-not-call-link_enter_set_routes-until-LINK_STATE_S.patch"
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1818340/+attachment/5243670/+files/0001-Do-not-call-link_enter_set_routes-until-LINK_STATE_S.patch
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https://bugs.launchpad.net/bugs/1818340
Title:
systemd-networkd core dumps in bionic-proposed
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